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We will use the Racket Scheme implementation, which is principled and fast enough for our
purposes. You probably will want to use GNU Emacs as
your editor. I do. Or use XEmacs
if you prefer. The brief GNU Emacs Reference
Card can be helpful. If you want to run Racket from
inside Emacs, you will want to include these definitions in a file called
.emacs in your home directory. Later
in the course, when we study Haskell, we will use
the GHC implementation.